Q: What are all the triangular numbers up to 200?

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1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400 All the square numbers up to 20!

1,3,6,10,15,21,28,36,45,47,66,78,91,95

1'3'10 etc;

1, 3, 6, 10, 15, 21, 28, 36

Just count up all the even numbers which will all be divisible by 2

Numbers up to 200 divisible by both 2 and 3 = numbers to 200 divisible by 2*3 = 6 which is int(200/6) = int(33.33) = 33

There are exactly 200 of them.

There are 45 prime numbers that are less than 200 (including '1'.)

28 and 10 are both triangular numbers and add up to 38

1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78 and 91.

There are 44 of them. Use the formula T(n) = n*(n+1)/2 to find the nth one.

Yes

add up all the numbers, then divide by the amount of numbers. (in this case divide by 7

55

There are 80 such numbers.

20100

180: it has 18 factors.

100 and 100 can add to 200 50, 50, 50, and 50 can add to 200 8 25s can add to 200 20 10s can add to 200

1, 3, 6, 10, 15, 21, 28, 36, 45, 55.

Look up Gauss' Formula if you want to know how to calculate this. If you just want the answer, it's 20100.

Just as square numbers represent the number of dots in a square with a certain number of dots on each side, triangular numbers represent the dots that make up different sized triangles. The sequence that defines these numbers is [1 + 2 + 3 + ... + (n - 1) + n], as there is one dot at the top of the triangle, two dots in the next row, three in the next row, and so on (think of the setup for tenpin bowling - ten is the fourth triangular number (1 + 2 + 3 + 4 = 10)). Just as squares have an algebraic representation (x2) as well as a geometric one, triangular numbers can be expressed as (x2 + x)/2 - this can be proven by induction (algebraically), or geometrically. There are other polygonal numbers such as pentagonal and hexagonal numbers. The algebraic representation of these can be found by expressing them as a sum of triangular numbers (based on their geometric representations) Interestingly, the sum of two consecutive triangular numbers, is always a square number. This can be shown geometrically or algebraically as follows: (x2 + x)/2 + [(x + 1)2 + (x + 1)]/2 = [x2 + 2x + 1 + (x + 1)2]/2 = 2(x + 1)2/2 = (x + 1)2 So ALL polygonal numbers are dependent on triangular numbers! Hope this helps, Nick :)

The average of five numbers whose sum is 200 will always be 40, no matter which numbers you choose. When finding an average, you add up the numbers (find the sum of the set), then divide by the number of terms. In this case, the sum will always be 200, and there will always be five terms. This will always result in an average of 40. Ex/ 1 + 2 + 3 + 4 + 190 = 200 200 / 5 = 40 40 + 40 + 80 + 24 + 16 = 200 200 / 5 = 40

201

A triangular pyramid is a tetrahedron, or a solid three-dimensional figure made up of four triangular faces.

0, a triangular pryamid (or tetrahedron) is made up of four triangular faces.